The most common and most likely answer to this crossword clue is the 11 letter word LITERATURES
L
I
T
E
R
A
T
U
R
E
S
Buddy explains!

The straight part
We know that "printed materials" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case printed materials = literatures.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does LITERATURES mean?
LITERATURES noun- The body of all written works.
- The collected creative writing of a nation, people, group or culture.
- (usually preceded by the) All the papers, treatises etc. published in academic journals on a particular subject.
- Written fiction of a high standard.